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iOS页面动态化,怎么样用JSON数据的原生页面摆脱低效的H5页

iOS页面动态化,怎么样用JSON数据的原生页面摆脱低效的H5页

作者: 玺睿siri | 来源:发表于2017-05-03 14:50 被阅读101次

    最近花了几天时间研究了一下怎么用iOS原生页面高效的更新app页面样式,我的思路是使用仿H5样式的JSON数据,利用各种布局(流动,线性等布局)来动态更新页面样式。

    页面动态化主要的使用场景是app的电商页面,由于电商的业务需求较大,经常会需要改变各个banner的样式来满足业务的需求,所以需要客户端根据数据实时更新样式,下面说说我对页面动态化的理解跟思路。先看一下最后demo的效果:

    其他app是怎么做的
    用Charles抓包,发现京东跟网易考拉都是用type这个字段提前定义好各种banner的样式,通过后台返回的数据,来实现页面动态化更新,这样做有好的方面也有不好的地方:

    好的方面:提前定义好banner的样式,客户端只需要定义好各个样式的UI,根据type字段来展现就好
    不好的方面:只能根据定义好的样式来进行动态化更新,如果需要加入新的样式,需要提交新包

    我的做法
    客户端不定义banner样式,而是定义布局样式来实现高度动态更新页面,思路来自于CSS里定义的div+CSS布局,CSS里可以根据display的inline跟block值来进行布局,iOS里,我定义了几种常见的布局:

    FlowLayout:流式布局,根据display值横向或者纵向布局,根据屏幕宽度跟banner宽度换行
    LinearLayout:线性布局,纵向布局
    WaterfallLayout:瀑布流布局
    OneAndNLayout:左边一个大图,右边N张小图的布局
    StickyLayout:悬浮布局

    整体架构
    页面动态化 整体架构如下:



    每个UIViewController都是一个页面,页面是由一个个卡片组成的,卡片其实就是代表了一个布局样式,每个卡片是由一个个元素组成的,元素其实指的就是卡片布局样式下的各个banner,对应的JSON数据结构如下:

    {
    "cards":
    [

    {
    
                      "layout": 1,
    
                   "elements": [
    
                            {
     
                               },
                             {
                                     
                               },
                             ...
                    ]
              },
             {
                      "layout": 1,
                   "elements": [
                          {
                                     
                               },
                             {
                                     
                               },
                             ...
                    ]
              },
             ...
    ]
    

    }

    具体实现
    由于大部分页面内容都需要上下滑动显示更多内容的,所以页面动态化的实现是基于UICollectionView来做的,当然也可以使用UIScrollView来实现(淘宝天猫都是通过一个自定义具有回收复用机制的UIScrollView来展示动态化页面内容的),我的理解是既然UICollectionView可以通过自定义UICollectionViewLayout来展现自定义的cell,为什么不用还需要自己定义一个具有回收复用机制的UIScrollView去展现内容,UICollectionView自身就是带有回收复用机制的。我的具体实现,先看下整体的UML图:

    每个KBBaseCard代表了一个布局的卡片,对应UICollectionView里的一个section,KBBaseCard里elements的每个KBBaseElement代表了一个banner,对应UICollectionView里的一个item,KBBaseElement里的KBElementStyle提供banner需要展现的样式。KBElementStyle里的type字段是用来定义banner的样式,比方说type=1代表这个banner就是一张图。实际展示图如下:

    UICollectionViewLayout的自定义
    UICollectionView提供的UICollectionViewFlowLayout并不能满足我的对样式展现的需求,所以这里我们必须自己写一套UICollectionViewLayout来提供对KBBaseElement里style字段里的样式支持,核心方法如下,具体实现在本文中不做过多详解,大家可以自己查询一下相关的知识:

    • (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath
      {
      UICollectionViewLayoutAttributes *layoutAttributes = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];

      NSInteger sectionLayout = 1; // CardFlowLayout is the default layout

      if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:layoutForSection:)]) {
      sectionLayout = [self.delegate collectionView:self.collectionView layout:self layoutForSection:indexPath.section];
      }

      // CardFlowLayout 流式布局
      if (sectionLayout == 1) {
      [self handleLayoutAttributesForFlowLayout:layoutAttributes atIndexPath:indexPath];
      }
      // CardLinearLayout 线性布局
      if (sectionLayout == 2) {
      [self handleLayoutAttributesForLinearLayout:layoutAttributes atIndexPath:indexPath];
      }
      // CardOneAndNLayout 左边一张大图右边N张小图布局
      if (sectionLayout == 3) {
      [self handleLayoutAttributesForOneAndNLayout:layoutAttributes atIndexPath:indexPath];
      }
      // CardWaterfallLayout 瀑布流布局
      if (sectionLayout == 4) {
      [self handleLayoutAttributesForWaterfallLayout:layoutAttributes atIndexPath:indexPath];
      }

      return layoutAttributes;
      }

    JSON数据
    这里提供一个我自己创建的JSON mock数据,还有根据这个JSON数据最终展现出来的页面图

    JSON
    {
    "cards": [
    {
    "layout": 1,
    "style": {
    "backgroundColor": "#ffffff"
    },
    "elements": [
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/lqdbpar1xWZw5NuOB9ezf80UDm75Ei%2BZyMo%2BMgvE%2Bdunea_02T1704271119_480_240.jpg",
    "style": {
    "display": "inline",
    "margin": [
    "0",
    "0",
    "0.75",
    "0.75"
    ],
    "width_ratio": 0.5,
    "width_height_ratio": 2.0
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/i11BQFE2dWpzplHNBV1Tr8Hafa5zTz%2BCoxF%2BwIBS%2BKF2Vx_03T1704261946_480_240.jpg",
    "style": {
    "display": "inline",
    "margin": [
    "0",
    "0.75",
    "0.75",
    "0"
    ],
    "width_ratio": 0.5,
    "width_height_ratio": 2.0
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/KwaBThC4mguSnQCGBXVtfK4RmTTSeQ%2BZ5Ql%2BTNvQ%2BKNWzP_05T1704251128_480_240.jpg",
    "style": {
    "display": "inline",
    "margin": [
    "0.75",
    "0",
    "0",
    "0.75"
    ],
    "width_ratio": 0.5,
    "width_height_ratio": 2.0
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/G4LGkdg7si4p5ZzVBZUKmkTq7EeTKt%2BRRaE%2BfQyx%2B6JlfC_06T1704251128_480_240.jpg",
    "style": {
    "display": "inline",
    "margin": [
    "0.75",
    "0.75",
    "0",
    "0"
    ],
    "width_ratio": 0.5,
    "width_height_ratio": 2.0
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/HNkdnuFcFey5Om5GpNpO-C2LLgTrO3WtFT1704201935_960_210.jpg",
    "style": {
    "display": "block",
    "margin": [
    "0.75",
    "0",
    "0",
    "0"
    ],
    "width_height_ratio": 4.57
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/mrui23TlZJcRAocRWB70T1704262151_600_375.jpg",
    "style": {
    "display": "inline",
    "margin": [
    "0.75",
    "0",
    "0",
    "0.75"
    ],
    "width_ratio": 0.7,
    "width_height_ratio": 1.6
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/ppiV8ODszIZciIZbmQih-A6HUakFq6g6oLTNhT1704201914_474_555.jpg",
    "style": {
    "display": "inline",
    "margin": [
    "0.75",
    "0.75",
    "0",
    "0"
    ],
    "width_ratio": 0.3,
    "width_height_ratio": 0.685
    }
    }
    ]
    },
    {
    "layout": 3,
    "style": {
    "backgroundColor": "#ffffff"
    },
    "elements": [
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/KHASB80nO5JMsX1e2iChshdRT1704262150_480_480.jpg",
    "style": {
    "margin": [
    "0",
    "0",
    "0",
    "0.75"
    ],
    "width_ratio": 0.5,
    "width_height_ratio": 1.0
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/ygMuXb96hrtGtT6Wc9vZ2T17040101959_480_240.jpg",
    "style": {
    "margin": [
    "0",
    "0.75",
    "0.75",
    "0"
    ],
    "width_ratio": 0.5,
    "width_height_ratio": 2.0
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/ADB5IaeoJWP9pIzVmwzkfGKhT1704262151_480_240.jpg",
    "style": {
    "margin": [
    "0.75",
    "0.75",
    "0",
    "0"
    ],
    "width_ratio": 0.5,
    "width_height_ratio": 2.0
    }
    }
    ]
    },
    {
    "layout": 1,
    "style": {
    "backgroundColor": "#ffffff"
    },
    "elements": [
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/ppiV8ODszIZciIZbmQih-A6HUakFq6g6oLTNhT1704201914_474_555.jpg",
    "style": {
    "display": "inline",
    "margin": [
    "0",
    "0",
    "0",
    "0.75"
    ],
    "width_ratio": 0.5,
    "width_height_ratio": 0.856
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/mbO7ln3VxpAWxKkw84Ay-ys6BLHmk9LLRvwa4T1704201914_474_555.jpg",
    "style": {
    "display": "inline",
    "margin": [
    "0",
    "0.75",
    "0",
    "0"
    ],
    "width_ratio": 0.5,
    "width_height_ratio": 0.856
    }
    }
    ]
    },
    {
    "layout": 2,
    "style": {
    "backgroundColor": "#ffffff"
    },
    "elements": [
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/hwCkTs9AoDThXhv5k38dr2M0T1704242204_960_480.jpg",
    "style": {
    "margin": [
    "0",
    "0",
    "10",
    "0"
    ],
    "width_height_ratio": 2.0
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/Tt9TfxyDTSSirP27lXEiIsKPriT1704241519_960_480.jpg",
    "style": {
    "margin": [
    "0",
    "0",
    "10",
    "0"
    ],
    "width_height_ratio": 2.0
    }
    },
    {
    "type": 1,
    "image": "http://haitao.nos.netease.com/uey1sJ03lEOglRm626Th6dKrT1704242203_960_480.jpg",
    "style": {
    "margin": [
    "0",
    "0",
    "10",
    "0"
    ],
    "width_height_ratio": 2.0
    }
    }
    ]
    }
    ]
    }

    页面图

    本文转载自:http://kobedai.me/2017/04/28/iOS%E9%A1%B5%E9%9D%A2%E5%8A%A8%E6%80%81%E5%8C%96%EF%BC%8C%E6%80%8E%E4%B9%88%E6%A0%B7%E7%94%A8JSON%E6%95%B0%E6%8D%AE%E7%9A%84%E5%8E%9F%E7%94%9F%E9%A1%B5%E9%9D%A2%E6%91%86%E8%84%B1%E4%BD%8E%E6%95%88%E7%9A%84H5%E9%A1%B5%E9%9D%A2%EF%BC%8C%E6%9D%A5%E5%8A%A8%E6%80%81%E6%9B%B4%E6%96%B0app%E9%A1%B5%E9%9D%A2%E6%A0%B7%E5%BC%8F/

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